Regulating device for refrigerating plants.



0. LEVILLY. REGULATING DEVICE-FOR REFRIGERATING PLANTS.

APPLIQATIOH FILED JULY 8, 1907. 905,332,

Patented Dea 1, 1908.

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QLIVIER LEVILLY, OF PARIS, FRANCE.

I. maximum DEVICE son nnrnrennarrue PLANTS.

To all whom it may concern:

Be it known that I, OLIVIER LEVILLY, citizen. of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Regulating Devices for Refrigerating Plants, of which the following is a specification.

In refrigerating plants in which the cold is obtained through evaporating a volatile liquid and where the cold has .to be obtained "and maintained in several rooms at the same time, it is necessary, to regulate the admission of the fluid in the evaporators' and rooms according to conditions which vary with the speed of the compressor used for liquefying the volatilized gas, with the ressure which exists in the evaporators rom which depends therapidity of evaporation,

to the speed of the compressor. This pump A aspires from a tank B, in which. the apparatus is mounted, a suitable liquid such as oil for example, and forces this liquid through tube ainto a closed receptacle which comprises an air chamber 0 forming a pressure regulator, a cylinder d and a valve box.

Thisvalve-box communicates with the .tnllk through an orifice f which can be regulated by means of a pointed regulating screw g. In the cylinder 01 a piston 71, is movably arranged, the rod i of which terminates in a plate is.

The regulating screw 9 can, at any moment, be adjusted so that piston h maintains itself at any desired position as long as the speed of the compressor will be the same; when the speed should vary, the piston will ascend or descend, so that its position always corresponds to the pressure of the oil I) contained in the receptacle. exceptiona'll great speed, the piston h could get to the highest point of the ascending motion, it will open the outlet valve m and, from this moment, all the liquid forced into Specification of Letters Patent. Application filed July s, 1907. semi No. 382,810..

.gas is distributed through 'the'plate' k the *pintles of which have e'ach an If, owing to an Patented Dec. 1, 1908.

the receptacle by the pump, will immediately flow back into the tank. 3

The plate is fixed on piston h operates the regulators of the outlets for the different evaporators. In the drawing three cooling rooms are supposed wherefor three evaporators are provided, to which the liquefied regulating valves n, The liquid is supplied to said valves through the pipes 0 and is conductedto the evaporators throughthe pipes p. Between the twopipes the regulating valve is arranged which consists of a rod g supporting the valve 1' and having conical incisions s; a strong spring t tends to continuously maintain the valve 1 pressed against its seat. The

lower ends of the rods g are connected with of the pistonrod through the links u, arm to whi'chis attached one'endof a' .wire w, the other end of which is connected with the thermostat placed in the room corresponding to the regulator.

The, valve-box d-has a valve a: which is connected to piston y which is subjected to the differential action, of the mercury in The annular space of this the cylinder 2;

cylinder communicates at any'suitable point with the system of channels which connects the different evaporatorsv with the compressor. Therefore, there will exist above the mercury in this annular space a constant pressure equal to-the pressure which exists at the outlet ports of all the evaporat ors.

. The operation of the regulator is as follows: Suppose the apparatus is in normal motion; in this case the compressor actuates the pump which forces the liquid I) under the piston h and through the orifice f, which has been conveniently regulated, so that the pressure which therefrom is produced under the piston h is exactly equalized by the pressure to which this piston is submitted under the influence of the weights which it supports and the difierent springs 15.. If now in any of the rooms to be cooled the temperature should rise above thefixed limit, the corresponding arm c which tends to stretch the elbow-lever a and consequently to further lift the valve 1", s; when the temperature will have returned .to the normal degree, the tension of wire w will diminish and the spring t will pull the valve 1 s back to its original position. If, for any reason, the speed of the wire to will exert a traction on the should increase, the piston h he lifted proportionally and would 1 position of equilibrium in 2 cent valves 7*, swould be more a .efore, When the pressure at the x is of the evaporatorsshould in- ;c abnormal value, the piston 3/ d be ifted and open the valve (0 whereiilcws a sudden diminution of presclosed receptacle 5) and the piston ally descend; at the beginning tenhing motion of the piston the will stretch but, as the stroke-of the can stretch, all valves 7, s will ecusly be closed, until the pressure p'orators has become normal, at k611i valve a: will close and piston assume its position of equilibrium. iephenornena will be produced when pressor should reduce its speed under predetermined limit, T

Obviously, the apparatus represented in he drawing is only shown by way of, ex-

ed this is particularly the case with the valve a: for the opening of'which a very great tion the rotation of which can be easily operated fron'i piston 3 and which would establish the communication between the recept'acle Z the oil tank.

What I claim as my invention, is:'

A regulator for .refri erating machines which automatically regulates the supply of s longer than the distance forwhichole and.the/constructional details can be; pro'jectingfrom the joint "ed by a valve-cock of suitable construcrefrigerating fluid to the refrigerators of the different cooling rooms according to the speed of the compressor, and to the temperatures of the difi'erent cooling rooms, comprising in combination a. circulation pump, an oil tank from which said pump aspires-the oil, a closed receptacle into which the oil is forced by the pump communicating through an adjustable orifice with the oil tank and composed of an air chamber for regulatin the pressure of the Oil in the receptacle am.

a mercury safety valve of suitable construction on said receptacle, and of the piston lifted by means of the oil in said receptacle, a plate fixed to the upper end of the piston rod, regulators for the supply of volatilized gas to the different cvaporators each comprising a casing through-which said ases areconducted, a regulating valve inclosed in said casing between the inlet and the out-' let for saidrgases, a strong spring for keeping the valve closed and jointed links conmeeting the rod of said valve with the plate of said piston in the oil-receptacle, an arm of the links and a wire connecting said arm with the thermostat in the cornesponding cooling room, sub

stantially as described and shown and for" the purpose set forth. In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. V

. OLIVIER LEVILLY.

Witnesses:

HANSON O. Come. ALFRED FREY. 

